How to smoothly rotate a Kinematic body 3d by 180° / PI when pressing 2 buttons?

xVladalex

Here are the details : 1. I made a basic walking movement system for a 3d character (which is just a bean , so no animations) binded to WASD 2. I was able to add a run / sprint "ability" to the bean (which also stiffens the movement) binded to the Shift key 3. At this point I wanted to make the character smoothly turn around (do a 180° turn) when the player presses both the S and Shift keys

What I did and the problems I had : 1. After doing some research on possible ways to accomplish this I decided to use a Tween 2. I tryed to use different types of initial / final values but I either get an error message in the debugger or the bean just goes backwards when pressing S + Shift 3. As of now it does turn around by 180° but the rotation is instantaneous and i get the same error message

The Code (comments are in italian) :

The error message I get :

I also have to note that I'm mostly a beginner when it comes to programming. Any help (with this particular problem or more efficent ways to write the code) are well appreciated! Oh, and if you could also provide some insight / explanation on what I did wrong or what your "fix" does, I would be very happy to read it.

xyz

Calling rotate_y() function as a tween argument makes no sense as it will instantly rotate your character. On top of that it'll return null which will then be used as an argument to interpolate_property() function. That's what causing the error, you supply null where actual value is expected.

So you should either use standalone rotate_y() if you want an immediate flip or call $flip.interpolate_property() with actual angles as arguments, if you need gradual transition. Like this: $flip.interpolate_property(self, "rotation_degrees", 0.0, 180.0, 2)

Also note that if you're tweening rotation_degrees property, your angle arguments should be in degrees. So it's 180 instead of PI.

xVladalex

Thanks for the reply!

@xyz said: Calling rotate_y() function as a tween argument makes no sense as it will instantly rotate your character. On top of that it'll return null which will then be used as an argument to interpolate_property() function. That's what causing the error, you supply null where actual value is expected.

This makes everything more clear since I completely forgot about this part of the Tween.

So you should either use standalone rotate_y() if you want an immediate flip or call $flip.interpolate_property() with actual angles as arguments, if you need gradual transition. Like this: $flip.interpolate_property(self, "rotation_degrees", 0.0, 180.0, 2)

Well after some thinking and looking around I eventually did find a solution to my problem :

2 variables and the get_rotation_degrees seem to be doing exactly what I wanted, although if there are better ways to accomplish this feel free to tell me

cybereality

The first parameter after the property name is the starting value, You can use null and it will just take the value that is already currently set.

xVladalex

@cybereality said: The first parameter after the property name is the starting value, You can use null and it will just take the value that is already currently set.

But then how can I change it (the null / current Vector3) in the final value by 180° on the Y axis ? Shouldn't I mess with it ouside the Tween?

cybereality

Yes, you'll still need the ending value for the tween, and this will have to be the value you calculate (by adding 180 to the current value).